Research shows that cationic surfactant HTAB increases consistency index in cellulose nanocrystal suspensions, indicating significant flow changes.
The influence of surfactants on the steady shear rheology of cellulose nanocrystal (referred to as NCC) suspension was investigated. Two surfactants, anionic sodium lauryl sulfate (referred to as Stepanol) and cationic hexadecyltrimethylammonium bromide (referred to as HTAB), were studied. The NCC concentration was fixed at 1 wt%. The surfactant concentration varied from 0 to 500 ppm. The influence of Stepanol was found to be weak whereas HTAB had a strong influence on the rheology of NCC suspension. The NCC suspension and surfactant-NCC suspensions were highly non-Newtonian shear-thinning. The power-law model described the rheological behavior of NCC suspension and surfactant-NCC suspensions adequately. The consistency and flow behavior indices varied only marginally with the addition of anionic surfactant Stepanol to NCC suspension. With the addition of cationic surfactant HTAB to NCC suspension, however, a large increase in consistency index was observed. The flow behavior index decreased simultaneously with the addition of HTAB to NCC suspension.
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Pal et al. (2025) studied this question.
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